If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below. PLEASE NOTE: We use an aggressive anti spam filter! If you have trouble registering please use the "Contact Us" link below and we'll help you get registered.

IRS Center section problem

I am once again reaching out to Guru's of the build for help. After many hours of effort trying to install the center section of the IRS (1 rear bolt goes in, but #2 bolt won't) I measured center of sleeve and center of holes on the ears of the center section. The holes on the center section are 3/16 of an inch wider than the center of the sleeves in the bushings. Any ideas?

I'm assuming you're describing the center section for the newer 2015 and up Mustang based IRS. It's a tight fit to be sure, and I too struggled to get the bolts to line up. I also thought they were maybe off a bit dimensionally. I made up some tapered pins though and it was really easy to get it lined up and the bolts all installed. Discussed in my build thread here: http://thefactoryfiveforum.com/showt...l=1#post209902

Hi Edward. Yes it is the newer 2015 center section. In this case the rear bolts are the issue. I will try the tapered pins but I will have to be careful not to destroy the treads in the case. But measuring center to center on the bushing sleeves and the same on the bolt holes in the case are off a touch more than 1/4 inch. Doing more measuring today.

I have taken more measurements and found the holes for the threaded bolts are 13 1/2" apart and the sleeves in the bushings are 13 3/8" apart. The 1/8" difference stop the bolt from being able to thread in. I have thought about shaving a little bit of material on the outside of each bushing to expande the distance but don't know if this is feasible. Thoughts?

I would try that. The main torque loading that the diff needs to handle is trying to make the rear move down and the front move up on accel. So having a little extra play sideways shouldn't be a problem. See how the stock bushings in the Mustang allow movement here.https://youtu.be/jEF_47B0K3Y

SUCCESSThanks CraigS. I did get it in . I started the right bolt then used a ratchet strap to pull the case to the left compressing the bushing enough to get the left bolt started. The front went in with just a little persuading. Ratchet straps are my friend.

The representations expressed are the representations and opinions of the TheFactoryFiveForum.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Factory Five Racing, Inc. or Ford Motor Company. This website has been planned and developed by TheFactoryFiveForum.com and its forum members and should not be construed as being endorsed by Factory Five Racing, Inc. or Ford Motor Company for any purpose. "FFR", "Factory Five", "Factory Five Racing", and the Factory Five Racing logo are registered trademarks of Factory Five Racing, Inc. TheFactoryFiveForum.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting the TheFactoryFiveForum.com.Copyright 2011 Factory Five Racing, Inc. All rights reserved. COBRA is a registered trademark of the Ford Motor Company. The Factory Five Forum is not connected to the holders of this mark. The Factory Five Forum is not connected in any way to Carroll Shelby.